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| ST7265X Datasheet, PDF (154/166 Pages) STMicroelectronics – LOW-POWER, FULL-SPEED USB 8-BIT MCU WITH 32K FLASH, 5K RAM, FLASH CARD I/F, TIMER, PWM, ADC, I2C, SPI | |||
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ST7265x
13.12 8-BIT ADC CHARACTERISTICS
Subject to general operating conditions for VDD, fOSC, and TA unless otherwise specified.
Symbol
Parameter
Conditions
Min
Typ 1)
Max
fADC
VAIN
RAIN
CADC
tSTAB
tADC
ADC clock frequency
Conversion range voltage 2)
External input resistor
Internal sample and hold capacitor
Stabilization time after ADC enable
Conversion time (Sample+Hold)
- Sample capacitor loading time
- Hold conversion time
fCPU=8MHz, fADC=2MHz
VSSA
4
VDDA
10 3)
6
0 4)
6
4
8
Figure 104. Typical Application with ADC
Unit
MHz
V
kâ¦
pF
µs
1/fADC
VDD
VAIN
RAIN
VDD
AINx
VDDA
CIO
~2pF
VT
0.6V
VT
0.6V
IL
±1µA
ADC
0.1µF
VSSA
ST72XXX
Notes:
1. Unless otherwise specified, typical data are based on TA=25°C and VDD-VSS=5V. They are given only as design guide-
lines and are not tested.
2. When VDDA and VSSA pins are not available on the pinout, the ADC refer to VDD and VSS .
3. Any added external serial resistor will downgrade the ADC accuracy (especially for resistance greater than 10kâ¦). Data
based on characterization results, not tested in production.
4. The stabilization time of the AD converter is masked by the first tLOAD. The first conversion after the enable is then
always valid.
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